Apparatus for regulating the gas mixture in gas-fired furnace installations



y 7, 1929- E. P. G. wUNsc-H 7 1,712,128

APPARATUS FOR REGULATING THE GAS IIXTURE IN GAS FIRED FURNACE INSTALLATIONS Filed. May 22, 1925 m E I I f Jmmw, L ma M We mm 61 W ,mUwmwa.

Patented May 7, 1929. a r 1,712,128

UNITED STATES PATENT OFFICEL ERICH PAUL GUIDO WIINS-GH, OF STEGLITZ, NEAR BERLIN, GERMANY, ASSIGNOR TO ASKANIA-WERKE AKTIENGESELLSCHAFT VORMALS CENTRALWER-KSTA'IT DES- SAU UND CARL BAIVIBERG-FRIEDE-NAU, O]? BERLIN-FRIEDENAU, GERMANY.

APPARATUS FOR BEGULATING THE GAS MIXTURE IN GAS-FIRED FURNACE INSTALLATIONS.

Application filed May 22, 1925, Serial No. 32,098, and in Germany May 31, 1924.

This invention relates to a method and an The air is admitted at atmospheric pressure apparatus for regulating the gas mixture through the air suction opening b opening in gas-fired furnace installations working into the atmospheric air, whilst the gas; for .with natural suction draft, more partieuinstance blast furnace gas, is supplied 5 larly in large furnace installations, such through the pipe 0. In the pipe 0 at the as blast furnace boilers, Cowper apparatus point corresponding to themouth of the pipe and th lik I), is provided a bafiie plate (Z by means of It has been already proposed to effect a which the gas pressure at this point, that is regulation of the gas mixture in furnace inat the point at which the gas enters the com- 10 n ti b d t mining the pressure in bustion device, can be measured in a manner the g s and air pipes for instance by means well known per se. The pressure acts als of baffle plates or the like built into the 1n :1 well known manner, for instance on a id pipes d b dj ti th tity f diaphragm a or on a piston or on some other air or the air pressure by means of a reguservomotor which controls a regulating valve,

15 lating device inserted into the air pipe, in for instance a throttle valve 6 mounted in the such a manner as to obtain the correct propipe 0, in such a manner that the gas presportion at any time between the quantity of sure at the point where the gas is admitted air and the quantity of gas or the air pr sinto the furnace installation will be always sure and the gas pressure. These mixture malntalned at atmospheric pressure. On the 20 regulators however cannotbe used for furupper and lower side of the diaphragm n naee installations working with natural suctwo pressure chambers are provided respection draft, that is to say in which no air tively one of which is'connected by a pipe p pp y takes Place rOUgh an air ip with the pipe 0 while the other opens into more particularly in such furnace instalthe atn'losphereic air. If the pressure in the lations of specially large'size such as blast pipe 0 increases the resulting movement of furnace boilers, Cowper apparatus etc, as the diaphragm will close the throttle valve 6 a regulation of the air admitted cannot to a greater extent. When the pressure dethere be carried out. creases, it will open the valve ,6 to a corre- The present invention obviates this drawspondingly greater extent. l/Vithin the com- 30 back byproducing; by means of a regulatbustion chamber by the natural draft a pres- -ing device, the same pressure at the gas insure is maintained which is less than atlet as at the air inlet. As the air inlet is n'iospheric, said pressure being regulable by in communication with the atmospheric air, the usual chimney damper indicated with the the arrangement must be such that the gas reference letter [0 pressure at the gas inlet shall be always main- As accordingly the same atmospheric tained at atmospheric pressure. The predepressure will always be obtained at the air termined correct ratio between the air and inlet and at the gas inlet, the natural sucthe gas will then be always automatically tion draft in the combustion installation maintained by the natural draft of the furwill draw in air and gas always in the same 10 nace installation, and a regulation of the proportion. The proportion otair and gas mixture consumption will then be effected in the'mixture therefore will always be the solely through the chimney as the natural same. In order to regulate the total quansuction d aft can be regulated by means of tity of mixture to be drawn in, it is merely the chimney damper. I necessary to increase or to reduce the nat 45 A construction according to the invention ural draft in the combustion installation, is diagrammatically illustrated in the acwhich can bedone'for instance by a smaller companying drawing in which or greater opening of the chimney damper.

Fig. 1 shows the application to a single The proportion between the air inlet openfurnace, Whilst mg and the gas inlet openlng of course must 50 Fig. 2 shows the application to a number he fixed beforehand in such a manner that, of furnaces arranged in parallel. with equal pressure, the quantity of gas and In Figure 1, a is a furnace of the kind in the quantity of air admitted will form the question, for instance a Cowper apparatus. correct mlxture. In installations in which;

air instead of being drawn in through a given opening is admitted into the combustion installation, for instance through a grate or other opening which cannot be controlled in its cross-section, it is advisable for the first regulation to provide in the gas pipe, between the baifie plate and the inlet for the gas into the furnace, a regulating damper 0 or the like which is so adjusted that with equal pressure at the gas and air inlets, the desired mixture will be formed.

In place of the baffle plate of course some other device could be used by means of which the pressure at the gas inlet could be regulated.

In the case of several combustion installations f, f, f connected in parallel, Figure 2, all the installations could be connected to one and the same gas inlet pipe 9, and only one pressure regulator h need be inserted into it, which maintains constant the pressure at this point. Into the branch pipes g 9 9 leading from the pipe 9 to the single furnaces, are then inserted constant resistances for instance bafile plates m, m 77?? which equalize the resistance in the pipe 9- ascertained the nature of my said invention and in what manner the same is to be performed, I declare that What I claim is 1. A gas-fired furnace comprising a furnace casing having an air suction opening therein in communication with the atmosphere; a pipe for feeding gas to the furnace; means for regulating the pressure in said pipe to maintain the gas adjacent the opening of the pipe into the furnace casing at atmospheric pressure; and means for increasing or decreasing the natural draft in the furnace casing to thereby regulate the amount of air and gas drawn into the casing.

2. A gas-fired furnace comprising a furnace casing having an air suction opening therein in communication with the atmosphere; a pipe for feeding gas to the furnace; adjustable means for regulating the pressure in said pipe to maintain the gas adjacent the opening of the pipe into the furnace casing at atmospheric pressure; a regulating damper in the pipe for regulating the amount of gas to attain a constant proportion of gas and air in the furnace independentof the conditions within the furnace; and means for increasing or decreasing the natural draft in the furnace casing to thereby regulate the amount of air and gas drawn into the casing.

3. A gas-fired furnace comprising a furnace casing having an air suction opening therein in communication with the atmos phere; a pipe for feeding gasto the furnace; adjustable means for regulating the pressure in said pipe to maintain the gas adjacent the opening of the pipe into the furnace casing at atmospheric pressure; means for regulating the air and gas mixture to provide a constant proportion independent of the conditions Within the furnace; and means for increasing or decreasing the natural draft in the furnace casing to thereby regulate the amount of air and gas drawn into the casing.

4. A gas-fired furnace comprising a furnace casing having an air suction opening therein in communication with the atmosphere; a pipe for feeding gasto the furnace; adjustable means for regulating the pressure in said pipe to maintain the gas adjacent the opening of the pipe into the furnace casing at atmospheric pressure; means for regulating the air and gas mixture to provide a constant proportion independent of the conditions within the furnace; and a chimney damper for regulating the natural draft in the furnace casing to thereby regulate the amount of air and gas drawn into the cas-. ing. In testimony whereof I have affixed signature.

ERICH PAUL GUIDO WUNsoH. 

